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w32file-unix-glob.c
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w32file-unix-glob.c
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/* $OpenBSD: glob.c,v 1.26 2005/11/28 17:50:12 deraadt Exp $ */
/**
* \file
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Guido van Rossum.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* mono_w32file_unix_glob(3) -- a subset of the one defined in POSIX 1003.2.
*
* Optional extra services, controlled by flags not defined by POSIX:
*
* GLOB_MAGCHAR:
* Set in gl_flags if pattern contained a globbing character.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <glib.h>
#include <ctype.h>
#include <errno.h>
#include <mono/utils/mono-errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "w32file-unix-glob.h"
#define EOS '\0'
#define NOT '!'
#define QUESTION '?'
#define QUOTE '\\'
#define STAR '*'
#ifndef DEBUG
#define M_QUOTE 0x8000
#define M_PROTECT 0x4000
#define M_MASK 0xffff
#define M_ASCII 0x00ff
typedef unsigned short Char;
#else
#define M_QUOTE 0x80
#define M_PROTECT 0x40
#define M_MASK 0xff
#define M_ASCII 0x7f
typedef char Char;
#endif
#define CHAR(c) ((gchar)((c)&M_ASCII))
#define META(c) ((gchar)((c)|M_QUOTE))
#define M_ALL META('*')
#define M_ONE META('?')
#define ismeta(c) (((c)&M_QUOTE) != 0)
static int
g_Ctoc(const gchar *, char *, unsigned int);
static int
glob0(GDir *dir, const gchar *, mono_w32file_unix_glob_t *, gboolean, gboolean);
static int
glob1(GDir *dir, gchar *, gchar *, mono_w32file_unix_glob_t *, size_t *, gboolean, gboolean);
static int
glob3(GDir *dir, gchar *, gchar *, mono_w32file_unix_glob_t *, size_t *, gboolean, gboolean);
static int
globextend(const gchar *, mono_w32file_unix_glob_t *, size_t *);
static int
match(const gchar *, gchar *, gchar *, gboolean);
#ifdef DEBUG_ENABLED
static void qprintf(const char *, Char *);
#endif
int
mono_w32file_unix_glob(GDir *dir, const char *pattern, int flags, mono_w32file_unix_glob_t *pglob)
{
const unsigned char *patnext;
int c;
gchar *bufnext, *bufend, patbuf[PATH_MAX];
patnext = (unsigned char *) pattern;
if (!(flags & W32FILE_UNIX_GLOB_APPEND)) {
pglob->gl_pathc = 0;
pglob->gl_pathv = NULL;
pglob->gl_offs = 0;
}
pglob->gl_flags = flags & ~W32FILE_UNIX_GLOB_MAGCHAR;
bufnext = patbuf;
bufend = bufnext + PATH_MAX - 1;
/* Protect the quoted characters. */
while (bufnext < bufend && (c = *patnext++) != EOS)
if (c == QUOTE) {
if ((c = *patnext++) == EOS) {
c = QUOTE;
--patnext;
}
*bufnext++ = c | M_PROTECT;
} else
*bufnext++ = c;
*bufnext = EOS;
return glob0(dir, patbuf, pglob, flags & W32FILE_UNIX_GLOB_IGNORECASE,
flags & W32FILE_UNIX_GLOB_UNIQUE);
}
/*
* The main glob() routine: compiles the pattern (optionally processing
* quotes), calls glob1() to do the real pattern matching, and finally
* sorts the list (unless unsorted operation is requested). Returns 0
* if things went well, nonzero if errors occurred. It is not an error
* to find no matches.
*/
static int
glob0(GDir *dir, const gchar *pattern, mono_w32file_unix_glob_t *pglob, gboolean ignorecase,
gboolean unique)
{
const gchar *qpatnext;
int c, err, oldpathc;
gchar *bufnext, patbuf[PATH_MAX];
size_t limit = 0;
qpatnext = pattern;
oldpathc = pglob->gl_pathc;
bufnext = patbuf;
/* We don't need to check for buffer overflow any more. */
while ((c = *qpatnext++) != EOS) {
switch (c) {
case QUESTION:
pglob->gl_flags |= W32FILE_UNIX_GLOB_MAGCHAR;
*bufnext++ = M_ONE;
break;
case STAR:
pglob->gl_flags |= W32FILE_UNIX_GLOB_MAGCHAR;
/* collapse adjacent stars to one,
* to avoid exponential behavior
*/
if (bufnext == patbuf || bufnext[-1] != M_ALL)
*bufnext++ = M_ALL;
break;
default:
*bufnext++ = CHAR(c);
break;
}
}
*bufnext = EOS;
#ifdef DEBUG_ENABLED
qprintf("glob0:", patbuf);
#endif
if ((err = glob1(dir, patbuf, patbuf+PATH_MAX-1, pglob, &limit,
ignorecase, unique)) != 0)
return(err);
if (pglob->gl_pathc == oldpathc) {
return(W32FILE_UNIX_GLOB_NOMATCH);
}
return(0);
}
static int
glob1(GDir *dir, gchar *pattern, gchar *pattern_last, mono_w32file_unix_glob_t *pglob,
size_t *limitp, gboolean ignorecase, gboolean unique)
{
/* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
if (*pattern == EOS)
return(0);
return(glob3(dir, pattern, pattern_last, pglob, limitp, ignorecase,
unique));
}
static gboolean contains (mono_w32file_unix_glob_t *pglob, const gchar *name)
{
int i;
char **pp;
if (pglob->gl_pathv != NULL) {
pp = pglob->gl_pathv + pglob->gl_offs;
for (i = pglob->gl_pathc; i--; ++pp) {
if (*pp) {
if (!strcmp (*pp, name)) {
return(TRUE);
}
}
}
}
return(FALSE);
}
static int
glob3(GDir *dir, gchar *pattern, gchar *pattern_last, mono_w32file_unix_glob_t *pglob,
size_t *limitp, gboolean ignorecase, gboolean unique)
{
const gchar *name;
/* Search directory for matching names. */
while ((name = g_dir_read_name(dir))) {
if (!match(name, pattern, pattern + strlen (pattern),
ignorecase)) {
continue;
}
if (!unique ||
!contains (pglob, name)) {
globextend (name, pglob, limitp);
}
}
return(0);
}
/*
* Extend the gl_pathv member of a mono_w32file_unix_glob_t structure to accommodate a new item,
* add the new item, and update gl_pathc.
*
* This assumes the BSD realloc, which only copies the block when its size
* crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
* behavior.
*
* Return 0 if new item added, error code if memory couldn't be allocated.
*
* Invariant of the mono_w32file_unix_glob_t structure:
* Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
* gl_pathv points to (gl_offs + gl_pathc + 1) items.
*/
static int
globextend(const gchar *path, mono_w32file_unix_glob_t *pglob, size_t *limitp)
{
char **pathv;
int i;
unsigned int newsize, len;
char *copy;
const gchar *p;
newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
/* FIXME: Can just use realloc(). */
pathv = pglob->gl_pathv ? (char**)g_realloc (pglob->gl_pathv, newsize) :
(char**)g_malloc (newsize);
if (pathv == NULL) {
g_free (pglob->gl_pathv);
pglob->gl_pathv = NULL;
return(W32FILE_UNIX_GLOB_NOSPACE);
}
if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
/* first time around -- clear initial gl_offs items */
pathv += pglob->gl_offs;
for (i = pglob->gl_offs; --i >= 0; )
*--pathv = NULL;
}
pglob->gl_pathv = pathv;
for (p = path; *p++;)
;
len = (size_t)(p - path);
*limitp += len;
if ((copy = (char *)malloc(len)) != NULL) {
if (g_Ctoc(path, copy, len)) {
g_free (copy);
return(W32FILE_UNIX_GLOB_NOSPACE);
}
pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
}
pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
#if 0
/* Broken on opensuse 11 */
if ((pglob->gl_flags & W32FILE_UNIX_GLOB_LIMIT) &&
newsize + *limitp >= ARG_MAX) {
mono_set_errno (0);
return(W32FILE_UNIX_GLOB_NOSPACE);
}
#endif
return(copy == NULL ? W32FILE_UNIX_GLOB_NOSPACE : 0);
}
/*
* pattern matching function for filenames. Each occurrence of the *
* pattern causes a recursion level.
*/
static int
match(const gchar *name, gchar *pat, gchar *patend, gboolean ignorecase)
{
gchar c;
while (pat < patend) {
c = *pat++;
switch (c & M_MASK) {
case M_ALL:
if (pat == patend)
return(1);
do {
if (match(name, pat, patend, ignorecase))
return(1);
} while (*name++ != EOS);
return(0);
case M_ONE:
if (*name++ == EOS)
return(0);
break;
default:
if (ignorecase) {
if (g_ascii_tolower (*name++) != g_ascii_tolower (c))
return(0);
} else {
if (*name++ != c)
return(0);
}
break;
}
}
return(*name == EOS);
}
/* Free allocated data belonging to a mono_w32file_unix_glob_t structure. */
void
mono_w32file_unix_globfree(mono_w32file_unix_glob_t *pglob)
{
int i;
char **pp;
if (pglob->gl_pathv != NULL) {
pp = pglob->gl_pathv + pglob->gl_offs;
for (i = pglob->gl_pathc; i--; ++pp)
if (*pp)
g_free (*pp);
g_free (pglob->gl_pathv);
pglob->gl_pathv = NULL;
}
}
static int
g_Ctoc(const gchar *str, char *buf, unsigned int len)
{
while (len--) {
if ((*buf++ = *str++) == EOS)
return (0);
}
return (1);
}
#ifdef DEBUG_ENABLED
static void
qprintf(const char *str, Char *s)
{
Char *p;
(void)printf("%s:\n", str);
for (p = s; *p; p++)
(void)printf("%c", CHAR(*p));
(void)printf("\n");
for (p = s; *p; p++)
(void)printf("%c", *p & M_PROTECT ? '"' : ' ');
(void)printf("\n");
for (p = s; *p; p++)
(void)printf("%c", ismeta(*p) ? '_' : ' ');
(void)printf("\n");
}
#endif